Pulverizing-mill.



No. 823,127. I PATENTED JUNE 1.2, 1906.

S. R. KROM. y

PULVERIZING MILL.

APPLIOATION FILED JAN. 7. 1904. BENBWED AUG. 8.1905.

I 4 SHEETS-SHEET 1.

PATENTED JUNE l2, 1906.

s. R. KRQM. PULVERIZNG MILL.

APPLICATION FILED JAN. 7. 1904. AHINEWFD AUG. 8,1905.

4 SHEETS-SHEET 2.

No. 823,127. l PATENTED JUNE l2, 1906. S. R. KROM.

PULVERIZING MILL.

APPLICATION FILED JAN. 7. 1904. BBNEWBD AUG. 8.1905.

4 sIIEETsfsHI: T a.

. PATENTBD JUNE 12 S. R. KROM. PULVEJRIZING MILL. APPLIOATION PYILED un. 7. 1904. BEEWED AUG. 8,1905.

UNITED STATES PATENT oEEIoE.

STEPHEN R. KROM, OF PLAINFIELD, NEW JERSEY.

PULVERIZING-MILL.

Specication of Letters Patent.

Patented J' une 12, 1906.

Application iled ,January 7, 1904. Renewed August 8, 1905. Serial No. 273,321.

To all whom it 'may concern:

Be it known that I, STEPHEN R. KRoM, a citizen of theUnited States, residing at Plainfield, in the county of Union and State' of New:

they run against the hardened inner surface ducing a very heavy crushing pressure,w

of a rlng or annulus, the centrifugal force pfo- 'ch varies with the speed. The materials to be pulverized are automaticall fed and centrally and equally delivere to centrifugal' feeders, which deliver the materialsin awide` thin stream adjacent to and directly in the path of therollers, which pass over and pulverize the same before it can fall away.

The rollers and centrifugal feeders are in coacting sets, and the materials are preferably delivered the full width of the rollers.

These devices are preferably arranged ina vertical lane. They are suitably mounted, operate housed, and oiled, the details of which are hereinafter more particularly described. Y

In the drawings, Figure 1 is a central vertical section through the apparatus comprising my improvement. Fig. 2 is a plan and partial central section. Fig. 3 is a vertical section through the case and one of the roller devices and acentrifugal feeder and an elevation of the other rollers and feeders. Fig. 4 is an elevation of the base, the housing, and

. parts associated therewith in the same general position as Fig. 3.

Fig. 5 is a section and elevation at about the dotted line a: of Fig. 2 looking toward the support for the rollers. Fig.; 6 is a partial elevation representing a modified position of the rollers with reference to their crank-shaft. Fig. 7 is a partial vertical section and side elevation, and Fig. 8 an arts modified construction of the support for the rollers.

Referring especially to Figs. 1, 3, and 4, a represents acast basewith a discharge-throat a2 in the forward part below the semicircular portion in the base. a represents a housing,

also with a semicircular portion fitting over the' semicircular portion of the base and securely connected thereto by the bolts shown in Figs. 3 and 4. Secured to thebase and the housing upon the outer left-hand surface of the structure is a central plate g and doors g hinged thereto and closing up the circular a erture within this t e housing a. A and is bolted to the ortion of the casvt base at the right hand of igs. 1 and 2, and a cap or cover b of smaller area is bolted to the bearing-box b, the shaft c passing through the bearing-box and between the same and the cover b In this bearing-box b, as shown in Fig. 1, there is an oil-receptacle 2 and aperortion of the base a, and

Vtures formed through the bearing-box into the oil-receptacle and also apertures formed yin and through the cap or cover, which in the cap or cover are closed by plugs 4. Around the shaft c, within the apertures of the bearing-box and cover and depending into the oilreceptacle and into any oil contained tnerein, are chains 3, which revolve with the rotation of the shaft and carry up oil and deliver the same on the shaft, so that the oil `will spread ongitudinally of the shaft into the bearingsv for its proper automatic lubrication. A pulley c is secured to the outer end of the shaft c, and power is communicated by any suitable belt from any suitable source of supply to the pulley c and shaft c. A fly-wheel 'd 1s connected to the shaft c at the opposite end from that to'which the pulley is secured and at the opposite side of the bearing-box bf This iiy-wheel instead of' being made with spokes is preferably made with a web d', in which are formed hubs to receive the crankshafts n, hereinafter described. This fly- Wheel therefore performs the* two-fold function of a regulator of the speed and ofa support or carrier for the crushing-rollers. A disk e, With a recessed or offset center, surrounds the reduced end c2 of the shaft c, said disk at the recessed center being secured to the central surface of the fly-wheel d-that earing-box b fits upon is, the vhub thereof-and the disk e is provvided with elongated openings e', e ually spaced apart, (see Fig. 5,) the said disk c osing off the clrcular recess between the base a and resents a hopper structure with a forward extension h anda tubular inner prolongation or extension h2, the axis of the tubular extension agreeing exactly with a prolongation of the axis of the shaft c. This hopper and the parts formed therewithare suitably secured to and supported by the central plate g. The lower orti'on of the extension h is preferably forme hollow and with parts constituting bearings for a shaft i, on the outer end-of which is a pulley i and on the inner portion of which is a screw conveyer 7c. A disk 5 is preferably pinned to this shaft at the other side of the bearing from that occupied by the pulle i, so as to prevent any accidental longitu inal movement of the shaft i and the parts connected therewith. The screw conveyer is in 'so much of the tubular extension as passes within the central plate g and beneath the mouth of the hopper h, so that any material delivered into the hopper h may be moved along the tubular extension by the rotation of the pulley e', shaft i, and screw conveyer 7c, which may be operated by a band or `chain from' an suitable power device. The

inner end of t e tubular prolongation h2 at the lower portion is made with a dischargeaperture 7. I provide a tubular hub Z, secured .to the reduced end c2 of the shaft, the tubular part thereof bein of sufficiently liberal dimensions to loosey receive the free end of the tubular prolongation h2 and to freely revolve with the shaft around the same. This tubular hub Zismade with faces 6, triangularly-disposed with reference to one. another, and to these faces flanges on the larger ends of the centrifugal feeders m are securely fastened by bolts, as shown in Fig. 3. T hese'centrifu al feeders m are tapering and curved in the irection of rotation, the apei turesof their delivery ends m being small and of substantially the width of the inner face of the annulus or ring f, this width preferably being produced by enlarging the said centrifugal feed-ers adjacent to the free ends. (See Fig. 3.)

The crushing-rollers are mounted upon crank-pins n2, which crank-pins are carried by the cranks n', and the crank-shafts n of 6 5 said cranks are received in the hubs of the fly-wheel d, there being nuts 8 on the ends of the crank-shafts against the opposite surface of the said hubs to that against which the cranks n bear. The cranks, their crankshafts and crank-pins are thus loosely mounted, so that they are free to swing. Around each' crank-pin n2 is an auxiliary sleeve 9, and around the said auxiliarv sleeve and the back end of the crank-pin is a Iianged sleeve o. (See especially Fig. 2.) The flanged sleeve o is longer than the auxiliary sleeve 9, and while one end of the auxiliary sleeve 9 comes against the inner end of the flanged sleeve o the other end of the auxiliary sleeve 9 abuts against the nut and washer 11 upon the end of the crank-pin, and the projecting portion of the flanged sleeve o is terminated with a screw-cap 12. By this construction there is suihcent bearing for the roller, and the screw-cap 12 covers and prevents the access of dust from the crushin operations to the end of the crank-pin an the auxiliary sleeve, the said flanged sleeve 0 being essentially -neld to the crank-pin by the presence of 'the auxiliary sleeve 9, coming between the same and the nut and washer 11. In cross section the outer surface of the flange of the sleeve o is inclined to the axis of the crank-pin, and a collar o surrounds the flanged sleeve o, and this is made'with a sur face also inclined to the axis of the crank-pin, but in the opposite direction, and this collar o is securely held in place to the flanged sleeve o b bolts 10, which pass through the parts.

ach roller structure is completed by a ring or annulus r, which extends around the flanged sleeve o and collar o and the inner surface of which is provided with inclines in opposite directions to agree with the inclined surfaces of the said flanged sleeve and collar. Consequently when tension is applied to the bolts 10 they act to draw together the collar o and the flanged sleeve o and to clarnp'more` firmly to them, and in position, the said ring or annulus r. This ring or annulus 1" is made with a hardened-steel surface and is adapted to run against the inner surface of the annulus or ring f. i l

By reference to Fig. 3 and' to the arrow thereon, showing the direction, it will be noticed that in the line of motion the crankpins a2 are forward of the crank-shafts n. Consequently the rollers are pushed ahead, and the centrifugal motion forces the same against the inner surface of the ring f,'while in Fig. 6 the crank-pin in the line of motion is back of the crank-shaft and the roller is drawn behind the crank-shaft instead `ofbeing pushed ahead, as shown in Fig. 8. I do not limit myself in this particular, as the structures are the same and the action in the one is the equivalent of the other.

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With the construction Fig. 6 in the particular just described it will be apparent that the rollers will keep their own position andv movementof the roller toward the ring f and for any wear of the surface of the roller and the ring f, it vbeing possible with the disk e and the openings e to move toward the ring f, but not appreciably away from the same.

VInthe modified structure shown in Figs. 7 and 8 the ffy-wheel d is provided with radially-disposed recesses 13, the edges of which are'overlapped by plates 14, secured to theI fiy-wheel. Heads s are received and slide in these recesses beneath the overlapping edges of the plates 14. -To each head s there is formed a shaft s', carrying a roller 1", the shaft s preferably passing through such a recess as e in the vdisk e for limiting its movement, the said recess being arranged radially.

In the operation of the structure hereinbefore described thev material to be pu'lverized is fed into the hop er h. It is moved along in the tubular pro ongation h2 by the screw conveyer 7c, andit finds an exit at the dischar e-aperture 7 of the tubular prolongation 2. From this aperture it falls directly against the inner surface of the tubular head Z and into the hollow centrifugal feeders m. By the centrifugal motion produced by the high speed of rotation the material is forced y along through the centrifugal feeders m re-' ardless of their position, and the material finds an exit at the narrow and 'wide mouths of the delivery ends of said feeders-and against the inner surface of the ring or annulus f slightly in advance ofthe rollers and directly in their path, so that in the operation this material is practically no sooner delivered than the rollers pass over it and crush it, the materials being pulverized by the weight and centrifugal force applied to the rollers, and the motlon of rotation is so quick that it is possible for several rollers to pass over the same particles of material to thoroughly pulverize the same before said particles can fall away from the surface of the ring 'o1' annulus f. The material as pulver-ized falls into the lower portion of the receptacle between the base and the' housing and finds an exit through the discharge-throat a2. The hinged doors g are provided for giving access to the receptacle formed between the base and the housing and to the parts of the rollers and centrifugal feeders for the purpose of cleansing, oiling, and repairing. v

I claim as my invention- 1. In a pulverizing-mill, the combination with a ring or annulus against the inner surface of which material'is pulverized, of a series of, pivotally-mounted crushing--rollers running on said surface, hollow centrifugal feeding devices in the same plane as the crushing-rollers for delivering the material in front of and into the path of the rollers, and means for feeding the material to be pulverized axially and centrally to and in the same plane as the centrifugal feeding devices.

2. Ina pulverizing-mill, the combination with a ring or annulus against the inner surface of which material is pulverized, of a series of pivotally-mounted crushing-rollers runningA on the said surface, a hopper and a screw conveyer centrally placed and adapted for feeding the material to be pulverized to the axial center ofthe machine, and centrifugal feeding devices receiving the material from the said conveyer and for delivering the same in front of and into the path of the roller. i A 3. In a pulverizing-mill, the combination i with a ring or annulus against the inner surface of which material is pulverized, of a se ries of pivotally-mounted crushing-roilers running on the said surface, means for centrally feeding the material to be pulverized, a tubular portion in the axial center of the machine and surrounding a portion of the central feeding devices, and centrifugal feeders connect-ed to the said tubular structure and revolving therewith and receiving the material from said feeding devices and delivering the same in front of and into the path of the rollers to be pulvexized.

with a ring or annulus against the inner surface of which material is forced, of a main central shaft, a series of pivotally-mourited crushing-rollers running on the surface of said` rin or annulus, a device connected to the sha tand forming the support f or the rollers, a hopper andmeans axially 1n line with said shaft for feeding the material to be pulverized, and centrifugal feeding devices also supported upon said shaft and actuated thereby, receiving the material and for del1vering the same in front of and into the path of the rollers. Y

5. In a pulverizingmill, the combination with a ring or annulus against the mner surface of which material is pulverized, of a main central shaft, a series of pivotally-mounted said rin or annulus, a device connected to the shat and forming the sup ort for the rollers, va hopper, a tubular ro ongation of said hopper axially in line wlth said shaft, a

crushing-rollers running on .the surface of" IOO 4. In a pulverizing-mill, the' combination central shaft, a series o pivotally-mounted crushing-rollers running on the surface of said rin or annulus, a device connected to the sha t and forming the support for the rollers, a tubular hub structure connected to and rotating withv the said shaft and the series of crushing-rollers, and centrifugal feed-l ers mounted upon said tubular hub and having delivery ends running closely adjacent to the inner surface of the aforesaid ring or annulus and each centrifugal feeder comprising a curved and tapering structure where the curve is in the direction of rotation and means for centrally feedin the material to be pulverized and for deliverlng the same to the centrifugal feeders.

7. In a pulverizin -mill, and in combination, a main centra shaft, a tubular hub structure connected to and rotating with the said shaft, centrifugal feeding devices mount- -ed upon said tubular hub and havin narrow delivery ends, each centrifugal fee er comprising a curved and ta ering structure where the curve is in the irection of rotation, a tubular part placed axiall with said shaft and enterlng the tubular hu structure and having a discharge-aperture at its inner end, means for holding the material to be fed, and means for feeding the same to the said centrifugal feeders through said tubular par-t.

8. In a pulverizin -mill and in combination, a main centra shaft, a tubular hub structure connected to and rotating with theA said shaft, centrifugal feeding devices mounted upon said tubular hub and havin narrow delivery ends, each centrifugal fee er comprising a curved and ta ering structure where the curve is in the irectlon of rotation, a hopper, a tubular inner prolongation of said hopper havin a discharge-aperture at .its inner end, thesald tubular prolon ation being laxially in line with the said sha t and passing into the said tubular hub, a screw conveyer in said tubular prolongation, a shaft u on which the same 1s mounted, and means or rotatin said shaft and screw conveyer, whereby. t e contents ofthe hopper are pulverized andare continuously and progressively fed and delivered at the dischargeaperture'to the centrifugal feeders.

9. In a-pulverizing-mill, the combination with a ring or annulus against the inner surthe crushing-rollers are with a ring or annulus a ainst the inner surl face of which material 1s pulverized and a main central shaft and sup orts therefor, of a Ievoluble device connecte to said shaft and performing the office of a fly-wheel and provided with s aced-apart perforations, a series of connecte crank-shafts, cranks and crankpins, the crank-shafts passing through said perforations adapted to swing therein and secured to the revoluble device, a series of crushing-rollers mounted u on the crankpins, a disk .forming the bac of the pulverizing-mill housing and provided with spacedapart elongated erforations receiving the crankins and adjacent portions of the crushing-rol lers andserving to limit 'the swinging movement of said crushing-rollers.

11. In a crushing-mill, and in combination, a base and housing forming a substantially vertical casing, a circular device having a crushing-surface within the same, a substantially horizontal shaft projecting into said casing, a revoluble device fixed to and movable with said shaft, a plurality of cranks and crank-shafts carried thereby, and crank-pins formed therewith and projecting into the casing, a roller on each crank-pin located' within the casin and by centrifugal force running against te crushing-surface, a fixed structure at one side of said casing, and a revoluble structure `at the other side of said casing and mounted on said shaft and together closing the same, at op osite sides centrifugal feeding devices, with) their discharge-openings near the crushing-surface and in front of the rollers, a hollow structure forming a support for the lcentrifugal feeders and mounted on said shaft, and means connected to and passing through the fixed structure at one side of the casing forv conveying the material to be crushed to the centrifugal feeders.

12. In a ulverizing-mill, the combination with a shai, a revoluble device, a series of roller devices mounted thereon and a fixed ring having a crushing-surface against which 'the rollers bear, of a tubular hub structure mounted on said shaft and having triangularly-arranged faces and erforations,v a series of curved 'tapering ollow centrifugal feeders secured upon the triangularly-ar- IIO 13. In a pulverizing-mill, the combination with a shaft and a revoluble part, of a crankshaft, a crank and crank-pin connected together and pivotally mounted on the revoluble part, a nut and washer on the free end of the crank-pin, an auxiliar sleeve surrounding the major portion of t e crank-pinand coming a ainst the washer and nut at one end, a flange sleeve surrounding said auxiliary sleeve and the crank-pin at one end and extending forward of the crank-pin, a screwcap closing the end of the same and serving to adjacent to the crank-pin, the flange of the flanged sleeve having an inclined surface, a collar surrounding the flanged sleeve and having an inclined surface in the opposite direction, a ring or annulus surrounding the flanged sleeve and the collar and having inner surfaces agreeing with the inclined surface thereof, and bolts passing through the flange of the sleeve and the collar for holding the parts together and for securely clamping the ring or annulus thereto.

14. In a pulverizing-mill, the combination with a shaft and a revoluble part, of a crankshaft, a crank and crank-pin connected toble part, a nut and washer on the free end of the lcrank-pin, an auxiliary sleevesurrounding the major portion of the crank-pin and coming against the washer and nut at one end, a anged sleeve surrounding said auxiliary sleeve and the crank-pin at one end, and a ring or annulus having a hardened surface mounted upon said flanged sleeve, the parts together forming a roller structure and a device closing the end of the auxiliary sleeve and by which access is had to the nut.

.15. In i crushing-mill and in combination, a base and housing forming a substantially vertical casing, a circular device within the same having a crushing-surface, a substantially horizontal shaft projecting into said casin and a bearing therefor, a central plate and oors hinged thereto and at either side thereof for closing off the housing at one side, and a disk fitting the housing at the opposite side, and means for connecting the same to the said shaft whereby the housing is completely inclosed.

16. In a crushing-mill and in combination, a main central shaft, a series of pivotallymounted crushing-rollers, a common support 'for the said crushing-rollers mounted upon said shaft, a disk esupported by the said central shaft forming a closure at one keep dust away from the contacting surfaces gether and pivotally mounted on the revoluside of the pulverizing-mill and having apertures receiving and Within which parts of the crushing-rollers move and are limited.

17. In a pulverizing-mill, the combination with a ring or annulus against the inner surface of which material is pulverized land a main central shaft and supports therefor, of

'a revoluble device connected to said shaft and performing the office of a ily-wheel and provided with spaced-apart perforations, a Vseries of connected crank-shafts, cranks and crank-pins, the crank-shafts passing through said perforations adapted to swing therein and secured to the revoluble device, Vand aseries of crushing-rollers mounted upon the crank-pins and adapted to run upon the surface of the ring or annulus.

18. In a pulverizing-mill, the combination with a shaft, a revoluble device, a series of roller devices mounted thereon, and a fixed ring having a crushing-surface against which the rollers bear, of a tubular hub structure `mounted on said shaft and having triangularly-arranged faces and erforations, a series of curved tapering ollow centrifugal feeders secured upon the triangularly-arranged faces of the tubular hub and curved rearwardly or in the direction of rotation, the discharge-apertures thereof coming adjacent to the crushing-surface and in front of the path of the rollers, a hopper, means for supporting the same, the forward extension of the hopper forming a bearing, a tubular inner prolongation of the hopper communicating therewith, the free end of which passes into the aforesaid tubular hub and is provided with an aperture, a screw conveyer and a shaft therefor within the tubular prolongation of the hopper, and means for rotating the same, for progressing the material to be pulverized and delivering the same through the aperture to the hollow centrifugal feeders.

19. In a pulverizing-mill, the combination with a shaft, a revoluble part, a crank-shaft and crank-pin connected together and pivotally mounted on the revoluble part, of la flanged sleeve in part surrounding the crankpin and having an internal shoulder, an aux- IOO iliary sleeve surrounding the major portion of the crank-pin from the free end to the shoulder ofl the flanged sleeve, and a nut device on the free end of the crank-pin for retaining the auxiliary sleeve and flanged sleeve in position.

20. In a pulverizing-mill, the combination with a shaft, a revoluble part, a crank-shaft and crank-pin connected to ether and pivotally mounted on the revdluble part, of a flanged sleeve in part surrounding the crankpin and having an internal shoulder, an auxiliary sleeve surrounding the major portion of-the crank-pin from the free end to the shoulder of the flanged sleeve, and a nut de- Vice on the free end of the crank-pin for refor connecting and holding said parts' totaining the auxiliary sleeve and flanged gether. IC

sleeve in position, the flanged sleeve extend- Signed by me this 5th day of January, ing beyond the crank-pin, a screw-cap clos- 1904.

ing the end of said flanged sleeve, a collar STEPHEN R. KROM. surrounding the said flanged sleeve, a ring or Witnesses: annulus surrounding the anged sleeve and v GEO. T. PINCKNEY,

collar, and means, substantially as specified S. T. HAVILAND. 

